TSFS had really great character moments and all the crew got something to do and showed they really cared about each other and Spock. The Enterprise got blown up and McCoy says that great line whilst stood on a mountain watching the ashes of the Enterprise streak across the sky...

Spacedock escape, Kirk vs Kruge in the midst of a disintegrating planet. The Klingons murdering David, Pon Farr!, Self Destruct sequence. Vulcan scenes, the Excelsior, Grissom, BoP. So much was added to the Trek universe. Its great!